String 回避者游戏教程：分数不起作用

我一直在为这个站点上的一个整洁的回避游戏编写教程：。我一直到第5部分，直到那时，我完全遵循代码（在游戏结束时运行最终分数之前我停止了），我禁用了自动内核，使用了设备字体，并嵌入了文本

除非当我运行游戏时，无论有多少敌人出现，我的分数都不会从0变为0

显然，我一直收到1009错误，连接到“onTick”函数。我已经得出结论，它与“gameScore.addToValue（5）；”行有关。但我不知道如何解决这个问题。有人能帮我吗

如果有人能发现我忘记添加的东西，这里有一个我放在相关类中的代码示例

--==-- 射击二级： --==--

--==-- 分数等级： --==--`

---

您不能执行

gameScore.addToValue（5）

，因为您尚未创建类Score的实例。 当它不是静态方法时，调用它就好像它是静态方法一样。首先尝试初始化Score的实例

试试这个：

public var gameScore:Score = new Score();

---

现在您应该可以调用

addtoValue

函数了。

好消息：我再也不会收到那个错误了。坏消息是：当我玩游戏时，分数仍然保持在零。敌人一露面就给我分，什么事也没发生。有什么建议吗？您不需要在分数类中声明currentValue，因为它是从Main继承的。这可能就是您的分数为0的原因，它显示的是本地currentValue，而不是主类的值。希望这是有意义的。我修改了score类（如果你查看我的示例，我会相应地编辑你看到的内容），但它仍然不起作用。你在哪里创建scoreDisplay文本字段的实例并将其添加到本示例中的显示中，我看不到它？你是什么意思？在“分数”课上。我应该在显示器的什么位置添加它？我的意思是，我将“scoreDisplay”指定给我的主记分牌符号的实例名称。然后，当我把这个符号放在游戏屏幕上时，我给了这个符号的实例一个名字“gameScore”。我应该做些不同的事情吗？

package
{
  import flash.display.MovieClip;
  public class MainCounter extends MovieClip
  {
    public var currentValue:Number;
    public var addedValue:Number;

    public function MainCounter()
      {
        resetValue(); //This triggers the resetValue function.
      }

      //This runs on every "tick," or every time that the player does something worthy of earning points.
      public function addToValue( addedValue:Number ):void
      {
        currentValue = currentValue + addedValue; //This takes the current value/score and updates it by adding an extra amount to it.
        updateDisplay(); //This triggers the updateDisplay function.
      }

      //This resets the time and score to the original value (zero). This is set off when the score/timer is created in the first place, and potentially if the player grabs a certain power-up or hits an enemy.
      public function resetValue():void
      {
        currentValue = 0; //this resets the current value/score/etc. to zero.
        updateDisplay(); //This triggers the updateDisplay function.
      }

      //This function shows the current score/time/whatever, and thus triggers every time the value changes.
      public function updateDisplay():void
      {

      }
  }
}

package  
{
    import flash.text.TextField;

    //The "extends" part of this class allows this class to "inherit" every public variable and function from the "MainCounter" class.
    public class Score extends MainCounter 
    {   
        public var scoreDisplay:TextField;

        public function Score() 
        {
            super(); //"super()" allows a class to access the functions of the class that it's "extending" to.
        }

            //This function is given an "override" because otherwise, we'd have two "updateDisplay" functions thanks to the "extends MainCounter."
            override public function updateDisplay():void
            {
                super.updateDisplay(); //Any code that's in the updateDisplay function of MainCounter will run here, too.
            scoreDisplay.text = currentValue.toString();
            //Fun fact: any sequence of letters and numbers is called a "string" because it's a string of characters. Case in point,
            //the text properties of this Score. Now, currentValue is defined as a Number, but all Numbers have a function called toString()
            //that returns the number in the form of a string.
            }

        }

}

public var gameScore:Score = new Score();